Updated all installed Drupal modules to latest stable resp. dev versions.
Re-applied commit cc1a93f by cherrypicking, which got overwritten by Drupal module updates.
Addition for comment access.
Installed latest dev version of commons_notify to fix error "Fatal error: Call to undefined function message_subscribe_process_message()" when posting comments. See https://drupal.org/node/1979604#comment-7394776.